EP0548536B1 - Heizgerät für Raumheizung und Brauchwasserbereitung - Google Patents

Heizgerät für Raumheizung und Brauchwasserbereitung Download PDF

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Publication number
EP0548536B1
EP0548536B1 EP92119597A EP92119597A EP0548536B1 EP 0548536 B1 EP0548536 B1 EP 0548536B1 EP 92119597 A EP92119597 A EP 92119597A EP 92119597 A EP92119597 A EP 92119597A EP 0548536 B1 EP0548536 B1 EP 0548536B1
Authority
EP
European Patent Office
Prior art keywords
water
heating
domestic
storage tank
heat exchanger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92119597A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0548536A1 (de
Inventor
Hans-Jochen Dr.-Ing. Schwarz
Herbert Rehfuss
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP0548536A1 publication Critical patent/EP0548536A1/de
Application granted granted Critical
Publication of EP0548536B1 publication Critical patent/EP0548536B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D3/00—Hot-water central heating systems
    • F24D3/08—Hot-water central heating systems in combination with systems for domestic hot-water supply
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
    • F24H1/48—Water heaters for central heating incorporating heaters for domestic water
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/142—Connecting hydraulic components
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
    • F24H9/00—Details
    • F24H9/14—Arrangements for connecting different sections, e.g. in water heaters 
    • F24H9/148—Arrangements of boiler components on a frame or within a casing to build the fluid heater, e.g. boiler

Definitions

  • the invention relates to heaters according to the preamble of the main claim.
  • the heat exchanger directly acted upon by the combustion gases has the heating water flowing through it and the hot water circuit led through the device's internal hot water tank is branched off from the pipe system for the heating water.
  • These heaters are designed in such a way that they supply domestic water in sufficient quantities without any significant initial delay at the desired temperature, so that there is no need to install an external domestic hot water tank.
  • an additional tank is arranged, which is connected to the domestic hot water tank via two pipes. This version is relatively complex and requires additional installation space, which undesirably increases the volume of the heater.
  • GB-A 2 130 347 describes a heating system with hot water and heating water supply, in which a hot water tank is heated directly by a burner.
  • a heating network can also be supplied with heat by a heat exchanger located in the hot water tank and surrounded by the hot water.
  • the arrangement according to the invention with the characterizing features of the main claim has the advantage that the heat energy generated by the heat source is at least partially transferred without detour via the heating water to the stored and / or flowing hot water and that the heat content in the hot water tank in the pipe system for the heating water is involved.
  • the arrangement according to the invention replaces the parallel connection of the hot water circuit and the heating circuit which is customary in the known heaters with integrated domestic hot water preparation by a series connection of the two circuits, as a result of which their different heating requirements can be met better than previously in terms of control technology. This measure makes it possible to design the power / volume ratio of the heater so cheaply that the hot water comfort of an arrangement with an externally installed hot water tank is achieved without any appreciable increase in volume of the heater.
  • a three-way valve which is influenced by the water temperature in the process water outlet, can be arranged at the branch of the process water outlet from the internal hot water circuit carrying the process water, which initially allows the process water to flow primarily from the process water storage tank and then increasingly directly from the heat exchanger affected by the combustion gases into the process water outlet.
  • only the heat exchanger in the service water tank is provided for heating the heating water, the heat supply to the heating water being effected exclusively indirectly via the service water tank.
  • a second heat exchanger which is arranged parallel to the heat exchanger in the service water storage and which is directly acted upon by the combustion gases, and which is at least as long in the piping system for the heating water is included when the water temperature in the domestic hot water tank falls below a predetermined value.
  • the supply of heat to the domestic hot water tank necessary for maintaining the storage temperature can advantageously take place via both heat exchangers to the pipe system of the heating water.
  • the arrangements described above can be meaningfully supplemented with purely constructive measures with regard to the design and arrangement of the individual components or units of the device in order to optimize its performance / volume ratio.
  • a design that is compact despite the sufficient dimensioning of the domestic hot water tank is obtained if it is combined with the expansion vessel of the heater to form a unit arranged on the rear of the device, which preferably fills the outline profile of the heater as seen from the front as far as possible.
  • the assembly of the heater can be made easier if the unit consisting of the domestic hot water tank and expansion tank is designed as a mounting plate for the other components or units, such as gas and water fittings, pumps, valves, burners, combustion chambers, heat exchangers, flow safeguards, blowers and central electronics .
  • a special support frame for the entirety of all parts of the heater is dispensable if the structural unit directly forms the load-bearing device frame provided with means for fastening to a wall.
  • the piping effort can be reduced and the use of modern manufacturing methods can be facilitated if components or aggregates that are closely related to one another and / or connected by cables are combined to form prefabricated assemblies that can be individually attached to or preferably part of the piping are attached.
  • the device connections for gas, cold water, process water and for the heating network are expediently provided on the structural unit.
  • FIG. 1 shows the front view of the basic device structure of the first exemplary embodiment with the casing shell removed
  • FIG. 2 shows a side view of the device structure according to FIG Figure 1
  • Figures 3 and 4 each the device concept of the first and second embodiment.
  • the heater according to Figures 1 to 3 has an expansion vessel 10 which is fixedly connected to a domestic hot water tank 12 and together with this forms an assembly 14 arranged on the rear of the device.
  • This unit 14 is used in addition to the hot water storage and absorption of the expansion volume of the heating water as a mounting plate for other components or units of the heater and also forms its supporting frame, so that a special support frame is unnecessary.
  • the unit 14 fills the outline profile of the heater as seen from the front as far as possible and is provided on the edge with means 16 for fastening it to a wall. Furthermore, means 18 are provided on the assembly 14 for attaching a jacket shell, not shown in the drawing.
  • the other components or units of the heater are combined to preassembled modules 20, 22, 24, 26, which are each attached or can be attached to the supporting unit 14. These components are not shown in detail in FIGS. 1 and 2 and are only mentioned or described in connection with FIG. 3 to the extent necessary for understanding the device concept.
  • the components or units of an assembly 20, 22, 24, 26 are closely related to one another and / or are connected to one another or to the domestic hot water tank 12 and the expansion tank 10 via pipes, some of which are in the assemblies themselves and some are in the assembly 14 are integrated.
  • the device connections 28 for gas, 30 for cold water, 32 for process water and 34, 36 for a heating network are provided on the structural unit 14.
  • the assembly 20 contains i.a. a gas valve and a heat generator 39 consisting of a gas burner, a combustion chamber and a heat exchanger 38 acted upon by the combustion gases, which is located in series with the domestic hot water tank 12 in an internal hot water circuit 40a, 40b through which domestic water flows.
  • the flow section 40a of the hot water circuit opening into the upper area of the hot water tank 12 leads via a 3-way valve 42, the outlet of which is connected to the corresponding connection 32 on the structural unit 14 via a hot water outlet 44.
  • a hot water pump 46 is installed, which is combined with the 3-way valve 42 to form the assembly 22.
  • the lower area of the domestic hot water tank 12 is connected to the corresponding connection 30 on the structural unit 14 via a cold water inlet.
  • the transmission surfaces of a heat exchanger 50 which are configured as a coil, are arranged in the interior of the domestic water storage tank 12 and lie in the course of a heating water supply line system 52a, 52b.
  • the flow section 52a of this line system leads from the heat exchanger 50 via a heating water pump 54 to the device connection 34.
  • the return section 52b leads from the device connection 36 via a 3-way valve 56 to the heat exchanger 50 and is also connected to the water chamber 58 of the expansion tank 10.
  • a mixing line 60 leading to the flow section 52a branches off from the 3-way valve 56 and opens there between the heat exchanger 50 and the heating water pump 54.
  • the heating water pump 54, the 3-way valve 56 and the admixing line 60 are combined to form the assembly 24.
  • the assembly 26 contains the central electronics of the heater. This controls according to setpoint sensors (not shown) for the heating water flow temperature and the hot water discharge temperature and temperature sensors 62, 64, 66, 68 in the flow section 52a, in the hot water tank 12, in the hot water outlet 44 and on the heat exchanger 38, the functional elements of the heater, namely the Burner, pumps 46, 54 and 3-way valves 42, 46.
  • hot water When hot water is drawn, which reports a sensor, usually a differential pressure sensor, to the central electronics, hot water is immediately available from the hot water tank 12 in sufficient quantity to bridge the run-up time of the temperature in the heat generator 39.
  • a sensor usually a differential pressure sensor
  • the outgoing domestic water is mixed down to the setpoint.
  • the heat generator 39 is put into operation and the 3-way valve 42 is activated in such a way that an increasing proportion of the quantities of process water flowing through the heat generator 39 flows.
  • the 3-way valve 42 reverses so that the total amount of hot water flowing through is heated in a water heater principle.
  • the heat generator can be controlled either continuously or in 2-point operation.
  • the heating power is transferred directly, ie without the interposition of an additional transmission medium, to the process water in the hot water circuit 40a, 40b, so that there is a particularly short run-up time for the process water temperature.
  • the constructive design already described and a corresponding dimensioning of the burner output the domestic hot water comfort of a system with an external domestic hot water tank can be achieved without significantly increasing the volume of the device.
  • the temperature in the hot water tank 12 is raised to the desired value monitored by the temperature sensor 64 via the inner hot water circuit 40a, 40b with high transmission efficiency.
  • the thermal energy is transferred indirectly into the heating network via the domestic water storage tank 12 and the heat exchanger 50 arranged therein.
  • the 3-way valve 56 is activated in such a way that it divides the heating water return flow quantity into the mixing line 60 and the heat exchanger 50 in accordance with the setpoint deviation of the flow temperature.
  • the thermal energy in the domestic hot water tank 12 is initially used and the burner is only started when the lower switching point of the temperature sensor 64 has been reached.
  • the heat exchanger 50 in the domestic hot water tank 12 is dimensioned such that it can only transfer a partial output of the burner to the heating water.
  • the domestic hot water tank 12 in the device-internal line system 52a, 52b With appropriate dimensioning and design of the components and control elements, it can be achieved that the burner is continuously controlled in almost all heat demand conditions.
  • the concept according to the invention also enables flow temperatures in the range from 20 to 80 degrees Celsius without corrosion problems.
  • the second exemplary embodiment has a heat generator 70 with two heat exchangers 72, 74, at least one of which is provided with heat transfer surfaces directly acted upon by the combustion gases and the other at least indirectly, via the water content of the one heat exchanger, the thermal energy from the combustion gases receives.
  • the heat exchanger 72 is located in an internal hot water circuit 76a, 76b, which leads through a hot water tank 80 combined with an expansion vessel 78 and contains a 3-way valve 82 to which a hot water outlet 84 is connected.
  • the temperature in the process water outlet 84 is regulated as in the first exemplary embodiment, to the description of which reference is made.
  • the second heat exchanger 74 in the heat generator 70 is located in a line system 86a, 86b, for the heating water, the flow section 86a of which leads via a reversing valve 88 to a device connection 90 for the flow line of the heating network.
  • the return section 86b of the line system goes from a device connection 92 for the return line of the heating network via a heating water pump 94 to the heat exchanger 74 and is also connected to the water chamber 96 of the expansion vessel 78.
  • an admixing line 98 leads through the service water tank 80 to the return section 86b.
  • the admixing line 98 is shaped to form a coiled tubing forming a heat exchanger 100.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Steam Or Hot-Water Central Heating Systems (AREA)
  • Heat-Pump Type And Storage Water Heaters (AREA)
EP92119597A 1991-12-21 1992-11-17 Heizgerät für Raumheizung und Brauchwasserbereitung Expired - Lifetime EP0548536B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4142547A DE4142547C2 (de) 1991-12-21 1991-12-21 Heizgerät für Raumheizung und Brauchwasserbereitung
DE4142547 1991-12-21

Publications (2)

Publication Number Publication Date
EP0548536A1 EP0548536A1 (de) 1993-06-30
EP0548536B1 true EP0548536B1 (de) 1996-04-17

Family

ID=6447864

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92119597A Expired - Lifetime EP0548536B1 (de) 1991-12-21 1992-11-17 Heizgerät für Raumheizung und Brauchwasserbereitung

Country Status (3)

Country Link
EP (1) EP0548536B1 (es)
DE (2) DE4142547C2 (es)
ES (1) ES2086618T3 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT401572B (de) * 1993-03-17 1996-10-25 Rapido Waermetechnik Gmbh Kondensationsheizgerät
DE19911237C2 (de) * 1999-03-15 2001-02-08 Danfoss As Heizungsanlage und Verfahren zu ihrem Betrieb
AT410023B (de) * 1999-09-24 2003-01-27 Vaillant Gmbh Wasserheizanlage
EP2413046B1 (de) * 2010-07-30 2016-03-30 Grundfos Management A/S Brauchwassererwärmungseinheit

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2147397A5 (es) * 1971-07-26 1973-03-09 Chaffoteaux Et Maury
DE2911654A1 (de) * 1979-03-24 1980-10-02 Bosch Gmbh Robert Gas- oder oelbeheizter zentralheizungskessel
GB2130347B (en) * 1982-11-16 1986-05-21 Cosybug Limited Heating installaton
FR2595454B1 (fr) * 1986-03-07 1989-01-13 Elettro Termica Sud Spa Chaudiere a gaz
AT393316B (de) * 1989-10-04 1991-09-25 Vaillant Gmbh Verfahren zum steuern des durchlaufbetriebes bei brauchwasserzapfung an einem wandheizgeraet und vorrichtung zur durchfuehrung des verfahrens

Also Published As

Publication number Publication date
DE4142547C2 (de) 1993-11-25
DE59206043D1 (de) 1996-05-23
EP0548536A1 (de) 1993-06-30
DE4142547A1 (de) 1993-06-24
ES2086618T3 (es) 1996-07-01

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